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Star Formation Effi...
Star Formation Efficiencies at Giant Molecular Cloud Scales in the Molecular Disk of the Elliptical Galaxy NGC 5128 (Centaurus A)
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- Espada, D. (author)
- The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Verley, S. (author)
- Universidad de Granada
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- Miura, R. E. (author)
- National Astronomical Observatory of Japan
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- Israel, F. P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Henkel, C. (author)
- King Abdulaziz University,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Matsushita, S. (author)
- Academia Sinica Taiwan
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- Vila-Vilaro, B. (author)
- European Southern Observatory Santiago,Atacama Large Millimeter-submillimeter Array (ALMA)
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- Ott, J. (author)
- National Radio Astronomy Observatory Socorro
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- Morokuma-Matsui, K. (author)
- University of Tokyo, Japan,Japan Aerospace Exploration Agency (JAXA)
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- Peck, A. B. (author)
- Gemini Observatory North
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- Hirota, A. (author)
- Atacama Large Millimeter-submillimeter Array (ALMA),National Astronomical Observatory of Japan
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Quillen, A. C. (author)
- University of Rochester
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- Hogerheijde, M. R. (author)
- Universiteit Van Amsterdam,University of Amsterdam,Universiteit Leiden (UL),Leiden University (UL)
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- Neumayer, N. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Vlahakis, C. (author)
- National Radio Astronomy Observatory
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- Iono, D. (author)
- The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Kohno, K. (author)
- University of Tokyo, Japan
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(creator_code:org_t)
- 2019-12-12
- 2019
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 887:1
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Abstract
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- We present ALMA CO (1-0) observations toward the dust lane of the nearest elliptical and radio galaxy, NGC 5128 (Centaurus A), with high angular resolution (similar to 1 '', or 18 pc), including information from large to small spatial scales and total flux. We find a total molecular gas mass of 1.6 x 10(9) M-circle dot and reveal the presence of filamentary components more extended than previously seen, up to a radius of 4 kpc. We find that the global star formation rate is similar to 1 M-circle dot yr(-1), which yields a star formation efficiency (SFE) of 0.6 Gyr(-1) (depletion time tau = 1.5 Gyr), similar to those in disk galaxies. We show the most detailed view to date (40 pc resolution) of the relation between molecular gas and star formation within the stellar component of an elliptical galaxy, from a scale of several kiloparsecs to the circumnuclear region close to the powerful radio jet. Although on average the SFEs are similar to those of spiral galaxies, the circumnuclear disk (CND) presents SFEs of 0.3 Gyr(-1), lower by a factor of 4 than the outer disk. The low SFE in the CND is in contrast to the high SFEs found in the literature for the circumnuclear regions of some nearby disk galaxies with nuclear activity, probably as a result of larger shear motions and longer active galactic nucleus feedback. The higher SFEs in the outer disk suggest that only central molecular gas or filaments with sufficient density and strong shear motions will remain in similar to 1 Gyr, which will later result in the compact molecular distributions and low SFEs usually seen in other giant ellipticals with cold gas.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Multidisciplinär geovetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geosciences, Multidisciplinary (hsv//eng)
Keyword
- galaxies: star formation
- ISM: molecules
- galaxies: individual (NGC 5128)
- galaxies: nuclei
- galaxies: elliptical and lenticular, cD
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Espada, D.
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Verley, S.
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Miura, R. E.
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Israel, F. P.
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Henkel, C.
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Matsushita, S.
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show more...
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Vila-Vilaro, B.
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Ott, J.
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Morokuma-Matsui, ...
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Peck, A. B.
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Hirota, A.
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Aalto, Susanne, ...
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Quillen, A. C.
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Hogerheijde, M. ...
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Neumayer, N.
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Vlahakis, C.
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Iono, D.
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Kohno, K.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Other Earth and ...
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NATURAL SCIENCES
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and Earth and Relate ...
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Chalmers University of Technology